call upon vs sue

call upon

sue

verb
  • To file a legal action against someone, generally a non-criminal action. 

  • To clean (the beak, etc.). 

  • To leave high and dry on shore. 

  • To seek by request; to make application; to petition; to entreat; to plead. 

How often have the words call upon and sue occurred in a corpus of books? (source: Google Ngram Viewer )